Surface acoustic wave tapped meander delay line

Details Surface acoustic wave tapped meander delay line Surface acoustic wave tapped meander delay line

1985-04-22

1987-01-06

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

333195, 310313D, H03H 942

Patent

active

046350071

ABSTRACT:
A surface acoustic wave (SAW) meander type delay line (FIG. 8) is provided by a plurality of multistrip reflecting track changers (82, 84, 86, 88, 89) on a piezoelectric substrate (80) for folding back a SAW propagation path (106, 108) in serpentine manner. The meander delay line is tapped by simple RF tap means comprising single lossless coupling strips (110, 112) in the track changers removing only that portion of the SAW signal actually tapped out and converted to RF, and directly coupling out such signal portion over the entire bandwidth of the track changer. The single strips are on the center line between the arms of respective U-shaped multistrip couplers (102, 104) of the track changers. The structure enables high impedance direct RF multitap bus connection facilitating RF bus summation of many taps without a plural switching network.

REFERENCES:
patent: 3836876 (1974-09-01), Marshall et al.
patent: 3873946 (1973-03-01), Weglein
patent: 3979700 (1976-09-01), Groce
patent: 4037174 (1977-07-01), Moore et al.
"Surface Acoustic Wave Multistrip Components and Their Applications", Marshall et al, IEE Transactions on Sonics and Ultrasonics, Apr. 1983, pp. 134-144.
"Surface Acoustic Waves for RF Memory", Wang et al, Polytechnic Institute of New York, Dec. 1982.

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